Effect of dietary protein-to-energy ratio on reproduction in female redclaw crayfish Cherax quadricarinatus

Abstract

The e¡ect of eight diets with di¡erent protein-to-energy ratios (P^E ratio 510, 11, 14, 16, 18, 20, 22, 24 mg kJ À 1 ) on reproduction of female redclaw cray-¢sh Cherax quadricarinatus was tested under laboratory conditions. After 75 days, there was a signi¢cant e¡ect of the P^E ratio on ¢nal weight, spawning females and the number of juveniles per female. Using the broken-line and quadratic equations, optimal values for the P^E ratio were: 16.0, 17.1 and 16.0 mg kJ À 1 . The P^E ratio signi¢cantly a¡ected protein and carbohydrate content and energy in the hepatopancreas. The broken-line model indicated that the respective recommended values of the P^E ratio for these parameters were: 21.8, 16.7 and 18.6 mg kJ À 1 . The concentration of carbohydrates and energy in muscle tended to signi¢cantly diminish as the P^E ratio increased. From broken-line regression analysis, the recommended P^E ratio was 16.6 and 20.2 mg kJ À 1 respectively. No signi¢cant di¡erences were found in survival, fecundity, vitellin content in eggs, protein and lipid content in muscle and lipids in the hepatopancreas. We concluded that, overall, a P^E ratio of 18 AE 2 mg kJ À 1 is optimal for reproductive activity of female redclaw cray¢sh.

Effect of protein and lipid levels in diets for female red claw crayfishCherax quadricarinatuson quality of offspring (juvenile), with emphasis on growth performance, biochemical composition and stress resistance to low oxygen, high ammonia and salinity

“…A P:E ratio of 16.4 ± 0.6 mg kJ −1 in diets for female red claw crayfish increases the number of spawnings and juveniles per female, suggesting a better use of dietary energy (Rodríguez‐González et al . ). The highest final weight of juveniles that we obtained is higher than the weight reported by Pérez‐Medina (), who obtained 0.56–0.8 g after 62 days of cultivation using a commercial diet.…”

“…In previous studies, broodstock diet, in terms of protein and lipid levels given to spawners would influence reproductive performance (gonad maturation, number of spawns per female, fecundity) and early offspring quality (egg development, biochemical composition) (Rodríguez‐González ; Rodríguez‐González et al . , ). However, there are no studies that measured the influence of broodstock diet on further stages.…”

Effect of dietary protein and lipid levels on gonadal development of female redclaw crayfishCherax quadricarinatus

“…(, ) who found that diets with 26–33% P optimized growth and survival of juvenile and pre‐adult stages of the redclaw crayfish. Rodríguez‐González, Villarreal, Hernández‐Llamas, García‐Ulloa, Vazquez‐Boucard and Serrano‐Pinto () reported that the protein to energy ratio for optimum reproduction was 18 ± 2 mg kJ −1 . The present study shows that there is an interaction between dietary protein and lipid level causing specific effects on lipid accumulation in the hepatopancreas and changes in GSI.…”

A review of juvenile redclaw crayfish Cherax quadricarinatus (von Martens, 1898) aquaculture: global production practices and innovation

“…The protein requirement for good growth and efficient food conversion (food conversion ration: FCR = Feed Given / Animal Weight Gain) in redclaw has received considerable attention, with a number of studies identifying optimal protein inclusion rates in the diet (Cortés-Jacinto et al 2003, 2004a, 2004bMuzinic et al 2004;Thompson et al 2004;Campaña-Torres et al 2005;Cortes-Jacinto et al 2005;Thompson et al 2005;Rodríguez-González et al 2006;Thompson et al 2006;Metts et al 2007;Pavasovic et al 2007b;Saoud et al 2008;Zenteno-Savín et al 2008;Cortés-Jacinto et al 2009;Rodríguez-González et al 2009a;Gutiérrez and Rodríguez 2010;Garza de Yta et al 2011;Rodríguez-González et al 2011;Arredondo-Figueroa et al 2013;Stumpf et al 2014;Ranjan and Bavitha 2015) that are specific to the life history stage of the crayfish (Cortés-Jacinto et al 2009). These studies indicate that the protein requirement falls as redclaws age.…”